<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var arr = ['yellow', 'green', 'blue']

    // arr[5] = 'red'
    // arr[1] = 'pink'

    // console.log(arr)

    // var str = ''
    // var flag = '!'

    // for(var i = 0; i < arr.length; i++) {
    //   str += arr[i] + flag  // yellow|green|blue|
    // }

    // console.log( arr.join(',') )
  </script>
</body>
</html>